The same has to be taken through TRAN-1. However input credit that can be transferred to GST, is closing as per last return filed under service tax and other input invoices not considered in return but accounted before 31st july 2017.
In case credit is not shown in TRAN-1, then no benifit of input under GST. The input credit under earlier is lost and to be expensed off. However you may wait as the department is internally discussing on opening for filing of GST tRAN-1 again
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